Testing gypsum purity

April 16th, 2008|

Steps to test gypsum purity: 1. Determine SO3 and then divide by 0.8333 to get SO4, 2. Determine CaO and then divide by 1.4 to get Ca, 3. After checking that % SO4 x 40/96 = % Ca then: a. Add % SO4 and % Ca b. Divide by 4 to get theoretical LOI. c.